bug#33673: "guix system --help" does not detail how to use --on-error=strategy

[Efraim Flashner]

On Sun, Dec 09, 2018 at 12:16:47AM +0100, Ludovic Courtès wrote:
> Hi,
> 
> address@hidden skribis:
> 
> > The current output is:
> >
> > --on-error=STRATEGY    apply STRATEGY when an error occurs while reading
> > FILE
> 
> FWIW I think it’s reasonable for ‘--help’ to be generally more concise
> than the manual.  We could list the possible strategies here, but that
> might clutter the output more than is desirable.
> 
> > Additionally we now have so many commands in the help pages of guix
> > system and guix build that it would be nice to present them in a more
> > readable/categorized way.
> >
> > Would a patches for improvement in these areas be accepted?
> 
> Improvements are always welcome of course.  The main criterion would be
> to remain consistent with the rest of Guix and with GNU conventions that
> we follow.  Maybe it’s best to discuss what you have in mind first?
> 
> Thank you,
> Ludo’.
> 

I'd go with (one of: nothing-special, backtrace, debug)
with the assumption that for more information the manual is more
verbose.

I also just noticed that we have 'man guix-system', which could be more
verbose on the subject without needing to fit in a concise output.

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